For more, now, let's bring in abc news political analyst, matthew dowd. He's advised republicans and democrats. He's also in charlotte this morning. Good morning, matthew. A different kind of convention speech from president obama last night. More sober. A little more humble. Was it effective? And we learn from our mistakes. But we keep our eyes fixed on that distant horizon, knowing that prominence is with us. Apparently we don't have audio for matthew. George? Go ahead, matt. George, I think the speech was much less morning in america and let's have a cup of coffee. It was a modest proposal he was giving. And it was much -- I think the tone was right. Though I don't think he convinced people to trust him that he had the vision to move forward. Take a step back. After two conventions, where are we? It was tied going in. Still tied coming out? I think it's still tied coming out. But I have the expectation they'll have a slight bounce. You get a sense that people love barack obama, but that republicans are in an arranged marriage with mitt romney. And I think that is a difference that came out. Much more enthusiasm at this convention. A little less at the last. But I think we're in a margin of error race. One of the things that came out of the two conventions is you really get a sense of how deep the difference is between the two parties. How stark the difference is. Very deep differences between the party, philosophical. And interestingly enough, there's a huge demographic gulf. There's big gaps between younger voters with barack obama, older voters with mitt romney. Splits on men and women. Splits on race. So, it's a gulf, of demographics. Releasing 15 ads in 8 states. They have a huge financial advantage over president obama's campaign right now. They're going to hope that what worked in the primaries for them, these ads, are also going to do the trick in the general election. Yeah. You know, george, you know, september is a month of mistakes. And I think what they're trying to do is force the president to make a few mistakes in september. Release a bunch of ads. Make him respond to it. That's what you can expect out of september, how do you respond with the different things? And the debates begin in october. Matthew, thank you very much. We'll have a wrap-up on "this week." Both candidates are watching

This transcript has been automatically generated and may not be 100% accurate.

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